Abe’s Electronics Center via Amazon has Logitech MX ERGO Advanced Wireless Trackball for Windows PC and Mac for $77.57 with free shipping, you can save $22.42 at checkout.
- Logitech’s most advanced wireless trackball for Windows PC and Mac
- Unique adjustable hinge allows you to customize the trackball angle from 0 to 20 degrees
- Carefully sculpted shape gives your hand full palm and finger support
- Advanced optical tracking for accurate cursor control plus a precision mode button that lets you instantly switch between speed and high precision tracking
- Precision scroll-wheel with tilt and middle click allows for precise scrolling and convenient controls
- Battery holds power for up to 4 months on a full charge.
- One minute of charge gives up to a full day of use